package com.lagou.rpc.consumer.proxy;

import com.alibaba.fastjson.JSON;
import com.lagou.rpc.common.RpcRequest;
import com.lagou.rpc.common.RpcResponse;
import com.lagou.rpc.consumer.client.RpcClient;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.UUID;

/**
 * 客户端代理类-创建代理对象
 * 1.封装request请求对象
 * 2.创建RpcClient对象
 * 3.发送消息
 * 4.返回结果
 */
public class RpcClientProxy {


	private static final String LOCALHOST = "127.0.0.1";


	public static Object createProxy(Class serviceClass, RpcClient rpcClient) {

		return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
				new Class[]{serviceClass}, new InvocationHandler() {
					@Override
					public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
						//1.封装request请求对象
						RpcRequest rpcRequest = new RpcRequest();
						rpcRequest.setRequestId(UUID.randomUUID().toString());
						rpcRequest.setClassName(method.getDeclaringClass().getName());
						rpcRequest.setMethodName(method.getName());
						rpcRequest.setParameterTypes(method.getParameterTypes());
						rpcRequest.setParameters(args);
						//2.轮询地向服务器发送请求
//						RpcClient rpcClient = new RpcClient("127.0.0.1", 8899);

						try {
							//3.发送消息
							Object responseMsg = rpcClient.send(JSON.toJSONString(rpcRequest));
							RpcResponse rpcResponse = JSON.parseObject(responseMsg.toString(), RpcResponse.class);
							if (rpcResponse.getError() != null) {
								throw new RuntimeException(rpcResponse.getError());
							}
							//4.返回结果
							Object result = rpcResponse.getResult();
							return JSON.parseObject(result.toString(), method.getReturnType());
						} catch (Exception e) {
							throw e;
						}

					}
				});
	}
}
